No service to low service

Hi. I hope someone can help me. I've been fixing iPhones for a while now and usually don't have issues with repairs. We'll I changed the charging port on my iphone 5 and I have bad service now. Like I get the same bars almost as another iphone 5 where I usually would get good service. But like at my home I would usually get 1-2 bars. And now all I get is no service. Any clue what to do? I tried changing charging port antenna. Two of them. Tried the antenna from another iphone 5 that goes on the loud speaker. The little antenna by the earphone jack. And the long flex cable. Any help? I can't use my phone normally. This sucks. Any help is appreciated.